fix gallery view sort drop down empty values (#2990)

restore recent in main pace
trashcan example demo shell add multi select

lib/core/datatable/components/datatable/datatable.component.ts

@@ -524,6 +524,12 @@ export class DataTableComponent implements AfterContentInit, OnChanges, DoCheck
         return null;
     }
 
+    getSortableColumns() {
+        return this.data.getColumns().filter((currentColum) => {
+            return currentColum.sortable === true;
+        });
+    }
+
     private emitRowSelectionEvent(name: string, row: DataRow) {
         const domEvent = new CustomEvent(name, {
             detail: {